Sam Jackson has been in a number of games, normally reprising a role he's played on-screen. He has never, to the best of my knowledge, been in a Heroes of Newerth movie. Or TV show, for that matter.
Still, the little MOBA-that-could has enlisted his services regardless, resulting in the announcer pack you see above.
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If you don't feel like watching, yes, he says motherfucker. Repeatedly. I'm sure it was in the contract.
Heroes of Newerth - Samuel L. Jackson Announcer Pack [YouTube]